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Mazomanie Oak Barrens

No. 248


Photo by Thomas A. Meyer/DNR


Situated on a broad and gently undulating sand terrace along the Wisconsin River, Mazomanie Oak Barrens features a significant oak barrens remnant containing large scattered black oaks with bur oak, black cherry and small amounts of white oak. Groves of smaller oaks occur amid sand prairie openings with species such as big and little blue-stem, bronze-headed oval sedge, goat’s-rue, Carolina puccoon, June grass, clammy ground-cherry, rough blazing-star, prairie coreopsis, few-leaved sunflower and spiderwort. Common prickly-pear cacti are scattered throughout the site, attesting to the arid conditions. Within the matrix community are patches of oak woodland with white and black oaks and a shrub layer composed of American hazelnut and huckleberry. A wet prairie dominated by prairie cord grass is also present. Past disturbances include grazing and fire suppression, which diminished available habitat for sun-loving grasses and forbs but management activities such as tree thinning will help invigorate the area. Mazomanie Oak Barrens is owned by the DNR and was designated a State Natural Area in 1991.

Very few State Natural Areas have public facilities, but nearly all are open for a variety of recreational activities as indicated below. Generally, there are no picnic areas, restrooms, or other developments. Parking lots or designated parking areas are noted on individual SNA pages and maps. Trails, if present, are typically undesignated footpaths. If a developed trail is present, it will normally be noted on the SNA map and/or under the "Access" tab. A compass and topographic map or a GPS unit are useful tools for exploring larger, isolated SNAs.

The good majority of SNAs are isolated and have few or no facilities. Some SNAs have vehicle access lanes or parking lots, but their accessibility may vary depending on weather conditions. Parking lots and lanes are not plowed during winter. Hiking trails may be nonexistent or consist of undeveloped footpaths. A GPS unit or compass and a detailed topographic map are useful tools for exploring larger SNAs.

Entrance fees: Excepting Parfrey's Glen, the Cambrian Outlook in the Dells of the Wisconsin River, SNAs within State Parks and some within State Forests, all other DNR-owned SNAs do not have any admission fees.

Allowable activities: DNR-owned land

In general, the activities listed below are allowed on all DNR-owned SNA lands. Exceptions to this list of public uses, such as SNAs closed to hunting, are noted under the "Access" tab above and posted with signs on site.

Prohibited activities: all SNAs

  • Camping and campfires
  • Collecting of animals (other than legally harvested species), non-edible fungi, rocks, minerals, fossils, archaeological artifacts, soil, downed wood, or any other natural material, alive or dead.
  • Collecting for scientific research requires a permit issued by the DNR
  • Collecting of plants including seeds, roots or other non-edible parts of herbaceous plants such as wildflowers or grasses
  • Geocaching
  • Horseback riding
  • Rock climbing
  • Vehicles, including bicycles, ATVs, aircraft, and snowmobiles except on trails and roadways designated for their use.

For rules governing state-owned SNAs and other state lands, please consult Chapter NR 45 Wis. Admin. Code [exit DNR].


Within the Lower Wisconsin State Riverway, Dane County. T9N-R6E, Sections 23, 24 W½SE¼. 136 acres.

Driving directions

From the intersection of U.S. Highway 12 and State Highway 78 just east of Sauk City, go south on 78 for 1.2 miles, then west on County Highway Y for 1.4 miles to a parking area south of the road. Walk south into the site.

The DNR's state natural areas program is comprised of lands owned by the state, private conservation organizations, municipalities, other governmental agencies, educational institutions and private individuals. While the majority of SNAs are open to the public, access may vary according to individual ownership policies. Public use restrictions may apply due to public safety, or to protect endangered or threatened species or unique natural features. Lands may be temporarily closed due to specific management activities.

Users are encouraged to contact the landowner for more specific details. The data shown on these maps have been obtained from various sources, and are of varying age, reliability, and resolution. The data may contain errors or omissions and should not be interpreted as a legal representation of legal ownership boundaries. To create your custom map where you can zoom to a specific location, please use the DNR's Mapping Application.

Property Map [PDF]

Mazomanie Oak Barrens is owned by: Wisconsin DNR